CODLING MOTH IN COLORADO. 



13 



one exception) up to May 17, as shown diagrammatically in figure 2, 

 and probably would have continued growing larger had it not been 

 for the retarding influence of the weather, which began May 18 and 

 continued to May 21, inclusive. The temperature dropped consid- 

 erably on May 18 and was accompanied by 0.12 inch of precipitation. 



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Fig. 2. — Time of emergence of moths of the spring brood of the codling moth, Grand 



Junction, Colo., 1915. 



On the following day, May 19, the temperature dropped somewhat 

 lower and heavy rains (0.44 inch) occurred in the afternoon and 

 evening. The next day, May 20, was colder than the two preceding 

 days, the maximum temperature being 58° F. and the minimum 44° 

 F. In addition to the low temperature, it rained practically the en- 



